private void SaveNewEntries(IEnumerable <ResultEntry> entries, double queryOffset)
 {
     foreach (var nextEntry in entries)
     {
         trackEntries.AddOrUpdate(nextEntry.Track.Id, nextEntry, (_, currentEntry) => concatenator.Concat(currentEntry, nextEntry, queryOffset));
     }
 }
 public void ReturnNullWhenBothEntriesAreNull()
 {
     Assert.IsNull(concatenator.Concat(null, null));
 }